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WorksheetsResistance and Resistivity (Review)
Total questions: 10
Worksheet time: 75secs
Consider a wire length L, cross-sectional area A and a resistance R. A second wire at the same temperature has a length 2L and a cross-sectional are of 1/2A. What is the resistance of the second wire
R
2R
1/2 R
4R
What is the resistance of a wire when its length is reduced by half?
Halved
Quartered
Doubled
Quadrupled
Xylene works in an electric company. She always recommends that longer extension cords should have a thicker diameter. Her recommendation made because resistance is __________.
inversely with length and directly with cross-sectional area
directly with length and inversely with cross-sectional area
directly with both length and cross-sectional area
inversely with both length and cross-sectional area
The electrical resistance pf a metallic conductor is inversely proportional to its _____________.
Temperature
Length
Cross-sectional area
Resistivity
What is the unit of used to specify the amount of resistance?
Resistance
Ampere
Volts
Ohm
What symbol represented the unit Ohm?
β
α
Ω
ρ
It is the opposition of a material offers to current.
Voltage
Current
Resistance
Length
Which of the following is NOT included in the factors affecting resistance?
Temperature
Length
Cross-sectional area
Color
What is the correct formular in getting the resistance?
V=IxR
ρ=RLA
I = VP
None
What happens as more current flows through a resistor>
It explodes
It dissipates power
It cools down
It generates more heat
